Stairway



.l. H. SMITH.

STAIRWAY.

APPLICATION FILED MAY 1. 1920.

. 1 412 99 Patented Apr. 118, 1922;

wuentoz iii STAIBWAY.

Application filed May 7, 1920.

1 0 all whom it may concern:

Be it known that I, JOHN Hnoo SMrrI-i, a citizen of the United States, residing at Detroit, in the county of Vayne and State of Michigan, have invented certain new and useful Improvements in Stairways, of which the following is a specification.

This invention relates to stairs and has for its object cast metal stair parts that can be made in the foundry. The parts can be accurately made in the foundry and the stringers can be accurately punched. so that the stairs may be easily and quickly assembled together on the job.

The stair treads are so constructed as to carry a filler material which can be varied to suit the taste, such as cork. concrete or any other desirable insert.

in the drawings, v

Fig. 1 is a vertical longitudinal section. of a portion of a flight of stairs showing the parts assembled together.

Fig. 2is a vertical cross section fragmentary in character, taken on the line 2-2 of Fig. 1.

(4 represents a casting forming the tread of the stair; Z) a reticulated riser. The tread is provided with upwardly-curved portions (Z and 0 at front and back respectively which form the front and rear boundaries of the space adapted to contain a filler material 0 which may be cork. concrete or some composition material which provides a suitable tread surface. The tread at the front and bottom is provided with a slot 7" while at the rear and top is provided with a slot g into which can he slid the reticulated riser Z? to assemble the r sers and the tread together. At each side the tread is provided with a depending flange orrib ,1 through which bolts 7c can be passed to bolt the tread members to the stringers Z which are suitably punched to receive these bolts A. reinforcing rib 121 may be i'ised on the under side of the tread when desired.

It will readily be understood that the treads and the risers can be cheaply made Specification of Letters Patent.

Patented Apr. 1%, 1922.

Serial No. 379,502.

in foundries in standard sizes the stringers may be properly punched, and the parts sent to the j ob all ready for assembly. (lbriouslv the assembly of the treads and risers to the stringers is a matter that may be quicklv effected, while the tread surface may be easily filled into the container formed in. the top of each tread for this purpose.

The first corner of the strip is ribbed to prevent slipping and afford a -eood grip for the foot. ii U What I claim is:

1 In a stair-way, the combination of a pair of stringers with belt holes prepared therein at suitable points, a plurality of cast metal treads each having at each. end a depending integral. flange with holes prepared to register with some of the holes in the stringer, bolts for passing through such registering holes and securing the flanges to the inside of the two stringers to brace and tie the stringers together, each of the treads having a slot at the front and under side and at the rear and upper side. and

risers locked into the opposed slots adjoining treads when treads are bolted to the stringers.

2. In a stair-way, a pair of stringers with bolt holes prepared therein at i suitable points, a plurality of casting-s having plate like members with upiwu'dly turned-up portions at the front and back to form a seat for filler material and having at the ends turmddown integral flanges providml with belt holes, bolts for passing through said bolt holes of the flanges and the bolt holes of the Sill'lIlQfQIS when in registry to secure the castings to the two stringers and secure the two stringers together. each of said castings provided at the front under side and the top rear side with a riser slot. and risers adapted to engage in opposed slots of adjoining castings when the treads are bolted to the stringers to complete the stair assemblv.

In testimony whereof I atlix my signature. I L

' JOHN HUGO SMITII, 

